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I wasn't able to find any firm prices - value of these type of things go up and down, first the most valuable ones appear to be those made by Wade - apparently some editions of the pigs were made by other companies and are not as valuable. There are factors such as how many of each pig were produced. Having a quick look on the net I've seen sets sell for between £75 - £250. A cousin Wesley pig is apparently the most valuable and can get around £250 on it's own. There's an artical on the attached link about the pigs which wortha read.
There is also a Wade collectable site, might be worth tring to contact them to see if they can help you get a valuation - link below